package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 用户登录功能
 *
 * 程序启动后要求用户输入用户名和密码
 * 使用该用户名和密码去userinfo中查询数据，如果可以查询到该记录，则说明登录成功
 * 否则提示用户:用户名或密码错误
 *
 */
public class LoginDemo {
    public static void main(String[] args) {
        UserInfo userInfo = InputUtil.getInputObject(new UserInfo(),"欢迎登录","登录");

        try (Connection connection = DBUtil.getConnection()){

            Statement statement = connection.createStatement();
            String sql = "SELECT id,username,password,nickname,age " +
                         "FROM userinfo " +
                         "WHERE username='"+userInfo.getUsername()+"' " +
                         "AND password='"+userInfo.getPassword()+"'";

            ResultSet rs = statement.executeQuery(sql);
            if(rs.next()){
                System.out.println("登录成功");
            }else{
                System.out.println("登录失败,用户名或密码不正确");
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}










